I use ONMOUSEOUT a class written in VFP, you can download here at UT
You can see it on action on my LANZADOR app than you can download here too.
The app is in spanish but you want to see the buttons. the command buttons and toolbar buttons have this.
Mauricio
Be fast like the Fox
Be free like the Penguin
Se Rápido como el Zorro
Se libre como el Pingüino